.NET SDK

The SumUp(Opens in a new tab) package is the official .NET SDK for SumUp APIs. It targets all currently supported .NET releases and ships async-first clients.

Installation

dotnet add package SumUp --prerelease

Configure Authentication

Set the SUMUP_ACCESS_TOKEN environment variable or pass the token into SumUpClientOptions.

export SUMUP_ACCESS_TOKEN="sup_sk_MvxmLOl0..."

Examples

Online Payment Checkout

using System;
using SumUp;

using var client = new SumUpClient();

var merchantResponse = await client.Merchant.GetAsync();
var merchantCode = merchantResponse.Data?.MerchantProfile?.MerchantCode
    ?? throw new InvalidOperationException("Merchant code not returned.");

var checkoutReference = $"checkout-{Guid.NewGuid():N}";

var checkoutResponse = await client.Checkouts.CreateAsync(new CheckoutCreateRequest
{
    Amount = 10.00f,
    Currency = Currency.Eur,
    CheckoutReference = checkoutReference,
    MerchantCode = merchantCode,
    Description = "Test payment",
    RedirectUrl = "https://example.com/success",
    ReturnUrl = "https://example.com/webhook",
});

Console.WriteLine($"Checkout ID: {checkoutResponse.Data?.Id}");

Cloud API Checkout

using SumUp;

using var client = new SumUpClient();

var readerCheckout = await client.Readers.CreateCheckoutAsync(
    merchantCode: "your-merchant-code",
    readerId: "your-reader-id",
    body: new CreateReaderCheckoutRequest
    {
        Description = "Coffee purchase",
        ReturnUrl = "https://example.com/webhook",
        TotalAmount = new CreateReaderCheckoutRequestTotalAmount
        {
            Currency = "EUR",
            MinorUnit = 2,
            Value = 1000,
        },
    });

Console.WriteLine($"Reader checkout created: {readerCheckout.Data?.Data?.ClientTransactionId}");